TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2179/79

DTC Code DTC Name
C2179/79 Tire Pressure Monitor ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

DTC No. Detection Item DTC Detection Condition Trouble Area
C2179/79 Tire Pressure Monitor ECU Communication Stop Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

A01VAKBE48

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, read the IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization (Click here ) after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the tire pressure warning ECU and receiver M11*1, *3 or M30*2 connector and main body ECU (multiplex network body ECU) G78 connector.


      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      • *3: except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for Air Bag Caution Label with "9L" Identification Mark, except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type
      Tester Connection Condition Specified Condition
      M11-5 (PRG) - G78-4 (PRG) Always Below 1 Ω
      M11-5 (PRG) or G78-4 (PRG) - Body ground Always 10 kΩ or higher
      except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type
      Tester Connection Condition Specified Condition
      M30-5 (PRG2) - G78-4 (PRG) Always Below 1 Ω
      M30-5 (PRG2) or G78-4 (PRG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. REGISTRATION OF TRANSMITTER ID


    1. Register the transmitter ID for all wheels.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. PERFORM INITIALIZATION


    1. Perform initialization.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check for DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Trouble Codes
      OK
      DTC C2179/79 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here